SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78c643abaf305afbb33f7c83f4432cd466e2741e95aa02281d8838d76ef382b1' 
  AND token = 'jlVFxUuqLHRkjrqwkLQOKueSKSQXtfqlnChNZRzjDG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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