SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5797b553d0d8840bff7588d42fbbe37d4f41a28a39892c85eb139652a3d0ce36' 
  AND token = 'esj9xzFbKcovYti/tguDqYtBxLbnqzVpa+MQsBMqJEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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