SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dea9b70e42969cb214e392a4719074bea78ae6c484465c0f7395d6289762d8df' 
  AND token = 'zAVmCG/yKWl/3+ROnhopcVgqid09EXM7ZpFlCjn6pw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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