SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a3c1504d06b0c1b3f0ddff52de42833154becd2fc35f85b7f63a67f2ecabb90' 
  AND token = 'FnhP6Ppa+ngZhKX8sKBWv96UOMcBxBqMl31eKecxjGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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