SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be01e29356ae2baa7e907bc2a0bbfd6c5f093bf609dd16c97ac3381ce865b9f3' 
  AND token = 'S0utM0Y9BxrFyOXnWKZlX5QwAlLGYJx5ehYHU+zPrtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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