SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a433eb0ad07565b7d868f4926eb82bd6ee97652674e98a1b72cafb622e9c267' 
  AND token = '+2ypXgMBymFTRfwLkG0OjY2KuRmJf+KbLN9lRyqBp8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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