SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fe0e61646b19972ca04d73b720ea156817423af849dc20e12d095d886bf6163' 
  AND token = 'QD7Wujw9ZFkPDe4nNYYXqyxurTtiiCBu+zRcxMfyu6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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