SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90a55ccdedb0ea1593f361dffcac6bea1e55854b8fdb7e572c3c9a70de7b2673' 
  AND token = 'FAdBigj1ZqGvDqJybV2KuNDUDFOx5W3LH+cdO8fgXRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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