SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9497f8ab937fb5b7e73d00885960b0b6f90d6a1b6029f5b8f6dd2ff6cced539d' 
  AND token = '8KxpKh4sE4224TXVo4h9cg3K9GlJzXS3BWg9S8+yBLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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