SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ed95fda6675e2338fc49a52072873d336c94e7ff9b562ef2a91c1781866166d' 
  AND token = 'VldtvGGAko82/APPPU2hVdoVMbBivYciCiMIJqHDb1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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