SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34a3c4926161a239efdca31bbd5edc564d1f2fdac69951df08d78c8c9a098a6f' 
  AND token = '32rvuWoW+tRCKShm9QTmW7SdNYpvE+Y7lVwBQPCJNT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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