SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9565cbe7fc3d394a642baec7cf9a4bf711aa5f21fba61b2382ad8e64985fc401' 
  AND token = 'ykoO6+np/B2xG1iPqt/E//D6G6ZKJTjuNDhD1nFM9IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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