SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c25722fbb92190284fc29804fbc82283926cc84810e81fb35ca34b578a2496d' 
  AND token = 'FaL28CpUdvmGHrL5VVIpmkxt+xpOHbZEjJnWBzQS7m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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