SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb68e27a2f5611c058cceb563488d6a736f29b01e0826c7052201448bda145d7' 
  AND token = 'mxJw7vg2HplJI4wh+K3X7nW+Mk2NfZxp9jU8A7eN3Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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