Just put
.mov in the keyword filter, not *.mov
How to use the Keyword Filter
Also, QuickTime player does have that problem. That's why I prefer to use
VLC - (click on link) _ (choose nearest mirror site) because it doesn't react to links & has in-built codecs & is generally very reliable.
Also, those junky files that are .mov files are generally less than 50 MB. So in any case, if you arranged your search results by size then those smaller ones would be at the bottom;
Arrange search results by size. But filtering them out will get rid of them anyway.