SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '542b8084d6619c3b9f844c502c9cb9094d0f3e3894505e7e63e1d078130c0ef4' 
  AND token = 'Tc9gL9U09J/LX/hj5aeVrjAoCqIpVgw3lgCxKFx5TYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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