Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '996a575e652c367e23e54618ecdd46fb6d8335c77c64a82269c67670b96d1d78' 
  AND token = '5EOxYwybE1ztXmzmByb3DQga2+nEL1/wX6/iSauSGv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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