Preheat the air fryer to 400°F (200°C) for 5 minutes.
Pat the whole tilapia dry with paper towels to remove excess moisture.
In a small bowl, mix the kosher salt, black pepper, paprika, garlic powder, onion powder, and dried thyme.
Rub the olive oil all over the tilapia, including inside the cavity.
Sprinkle the seasoning mixture evenly over the entire fish, rubbing it in gently.
Place the lemon slices and fresh parsley sprigs inside the cavity of the tilapia.
Lightly spray or brush the air fryer basket with oil to prevent sticking.
Place the tilapia in the air fryer basket, laying it flat.
Cook the tilapia at 400°F (200°C) for 18 to 20 minutes, flipping halfway through cooking to ensure even crispiness.
Check for doneness by inserting a fork into the thickest part of the fish; the flesh should be opaque and flake easily.
Carefully remove the tilapia from the air fryer and transfer to a serving plate.
Serve immediately with additional lemon wedges if desired.