SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af64e80ce5d23d3bf085d237bd33842c45742ee2b7ffa953e162a1b6bf7b97d9' 
  AND token = 'hJRKTdGZvfUU7k0GcJ1D10vW6L1+SAYXK1IoLz9sbYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}