SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1185ae9697d8ca46341487c1b53a4060b39c9de745fa3767ff560be507a6a737' 
  AND token = 'kgPQIE+jwErvZtTS0YSJafa2hDcZXu42PFKlOIQR45A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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