Select all the filtered photos and place them in a collection. Then turn the filter off and select the collection and do your keywording from the collection.
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Use a Quick Collection. To do this select all that you’ve filtered with no keywords, then rightclick and choose Add to Quick Collection, then filter on the membership in the Quick Collection using the item at the top left near All Photographs and Previous Import, then remove the filter about not having any keywords. Once you’re done keywording, then just righ-click and choose Remove from Quick Collection. Do this in the Library Grid view so that it works on all the selected photos at once. You can also individually remove them from the quick-collection by clicking on the little gray balloon badge in the thumbnail.