SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e2d8bb51039e817bdd57133e39058aaf6d0f939f67ea2fa248e71a102f4f21f' 
  AND token = 'WxVeLwJ3ZdUwy+66uHnh8fvACSdX/MvFQ1YAQmj6g3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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