SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5d61a31f7ca97544c9155990bbb2ad2c418fb217a4a833002f5cb630664ecc1' 
  AND token = '6AAjG7AJbtMvJMGWiaRFsYqL3DgFknZHVk7PK5W124c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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