I'd still use it. It's just fish food.
Just as an example, I've purchased foods such as mysis, beefheart, Marine Cuisine etc on some of the hottest days here in California. By the time I got home from the LFS, the foods were nothing but hot mush. After a few hours in the freezer they were as good as new. I had no problems at all feeding both my freshwater & saltwater fish these foods.