SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3269c00d4cfea9f4056061d0295ad11412be3824e5b4400a8dee1350d96b7835' 
  AND token = 'tGUJnNFEipoLB9hkypQEPxeGmy8huj8jvUqcyhvy/ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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