Beat the cream cheese in a large bowl with a hand mixer until smooth.
Add the sour cream, mayonnaise, 1/4 cup of the cheddar, Old Bay, Worcestershire, ground mustard, garlic powder, lemon juice, salt and pepper. Mix on low about 1 minute. Taste and adjust.
Fold in the crab gently with a spatula, keeping the lumps intact.
Spread into a 1-quart oven-safe dish that fits your air fryer basket.
Air fry at 375°F for 5 minutes.
Stir once, smooth the top, and sprinkle on the remaining 1/2 cup cheddar.
Air fry at 375°F for 5 more minutes, until the cheese is melted and golden in spots and the center is hot (165°F).
Rest 2 to 3 minutes, garnish, and serve hot.