SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bba99eb35b217e39b3e947b2aa8e7ba1752149621d6232532b24fd57bffcd336' 
  AND token = 'lGB8A9vtu/WOxbPMp6v/MTlRAyZQCygDhzzlerctXGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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