Amps, as far as I know there is no airport/runway at Key largo. The old runway was sold and the owner sold Building lots along the " runway"

There is a runway / airport about 20 miles north Ocean Reef That may be where you are looking for.

I used to fly air taxi out of Opa Locka in the 80's but things have changed.

I would suggest you call whomever you are going to visit in Key Largo area and ask them.

Or, call up a Air Taxi service in Miami area.

BW