SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fd5e12f1f747d51fcf91538230b9b5c34f66446a9e6b49802e888778f255d68' 
  AND token = 'aOYBDg7vjXsPZ3srlR1iP/xNvHQwkefjsGF+tEtpjo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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