SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25fae280b0499c9342cfd023545f95c00c41b3302014678017583f67bf693646' 
  AND token = 'sL8dKcDf+xIoEz+JpynTnY9wDrsGpHIHy0MYxgM60XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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