RedirectMatch: Remove question mark - .htaccess

Question

I'm redirecting an old website to a new URL using RedirectMatch. (I don't need to preserve the original query string, hence the "?" at the end).
RedirectMatch 301 ^/cms/index.php$ http://www.mysite.com?
The redirect works, however I'm left with an ugly question mark at the end URL after being redirected:
www.mysite.com?
Is there any way to remove it?
Edit: I'm throwing in the .htacces file I'm using at the moment:
RedirectMatch 301 ^/cms/index.php$ http://www.mysite.com?
# BEGIN WPSuperCache
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
AddDefaultCharset UTF-8
RewriteCond %{REQUEST_METHOD} !POST
RewriteCond %{QUERY_STRING} !.*=.*
RewriteCond %{HTTP:Cookie} !^.*(comment_author_|wordpress_logged_in|wp-postpass_).*$
RewriteCond %{HTTP:X-Wap-Profile} !^[a-z0-9\"]+ [NC]
RewriteCond %{HTTP:Profile} !^[a-z0-9\"]+ [NC]
RewriteCond %{HTTP:Accept-Encoding} gzip
RewriteCond %{DOCUMENT_ROOT}/wp-content/cache/supercache/%{HTTP_HOST}/$1/index.html.gz -f
RewriteRule ^(.*) "/wp-content/cache/supercache/%{HTTP_HOST}/$1/index.html.gz" [L]
RewriteCond %{REQUEST_METHOD} !POST
RewriteCond %{QUERY_STRING} !.*=.*
RewriteCond %{HTTP:Cookie} !^.*(comment_author_|wordpress_logged_in|wp-postpass_).*$
RewriteCond %{HTTP:X-Wap-Profile} !^[a-z0-9\"]+ [NC]
RewriteCond %{HTTP:Profile} !^[a-z0-9\"]+ [NC]
RewriteCond %{DOCUMENT_ROOT}/wp-content/cache/supercache/%{HTTP_HOST}/$1/index.html -f
RewriteRule ^(.*) "/wp-content/cache/supercache/%{HTTP_HOST}/$1/index.html" [L]
</IfModule>
# END WPSuperCache
RewriteCond %{HTTP_HOST} ^mysite.com$
RewriteRule ^(.*)$ "http\:\/\/www\.mysite\.com\/$1" [R=301,L]
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
EDIT: In the end I got it working using anubhava suggestion. BUT I had to make a separate .htaccess file in the /cms folder.

Answer 1

Better use mod_rewrite using code like this:
Options +FollowSymLinks -MultiViews
# Turn mod_rewrite on
RewriteEngine On
RewriteBase /
RewriteRule ^cms/index\.php$ http://www.mysite.com/? [L,R=301,NC]