SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d8b93bdfc00ca446f6ff6487537423fa14e54930b7f12167d9986b7be0a579a' 
  AND token = 'ia0svoqouXT3UZyI56/DYkgYtusTnm1Y4w9TFCdzoqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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