Slice the green tomatoes into 1/3 inch thick rounds. Sprinkle both sides lightly with a little salt and place on paper towels for 5 minutes to draw out some moisture, then pat dry.
Set up a three-bowl breading station. Place the flour in the first bowl. Place the beaten eggs in the second bowl. In the third bowl, combine the cornmeal, panko breadcrumbs, garlic powder, smoked paprika, remaining salt, black pepper, and cayenne pepper.
Dredge each tomato slice in the flour, shaking off the excess. Dip in the egg, letting any excess drip off, then press firmly into the cornmeal mixture, coating both sides completely.
Preheat the air fryer to 400°F (200°C) for 3 minutes. Spray the basket with cooking spray.
Place the breaded tomato slices in a single layer in the basket without overlapping. Spray the tops generously with cooking spray.
Air fry at 400°F for 10 to 12 minutes, flipping once at the halfway mark and spraying the other side, until golden brown and crispy on both sides.
Serve immediately while hot and crunchy with ranch dressing or remoulade on the side.