SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0defcd4c5ab12c5b93ce168198b68e45cbd9648b34ac37ac8bf093c7950e87f' 
  AND token = 'Rqcv7rIIm5KrzR9OvVXGB8vZhFWhi+mQQP2xDz3STYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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