SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb5ba8113c08363b96f5f80953ef2bd724266a981b70c1b5aa9612fbb57beed2' 
  AND token = 'yZmnaHoJ2iy8Iq5pzSQMT/ws5UJOBnISXV5hHuJop08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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