score:7
Krabi airport has two terminals, I presume you're referring to the international one.
As of January 2017, the fresh food selection once past security & immigration when departing is limited to a cafe. I can't claim to recall its menu in detail, but the offerings were overpriced and bland, certainly no edible insects in sight (and this is not a thing you really see outside street food/night markets anyway).
There are also a bunch of souvenir shops selling dried mangoes, cans of Pringles etc, with 200-300% markups. I specifically recall the same bag of dried mango that's around 250 baht at the supermarket being hawked for 600.