Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffe2688d0bdaeef2fffa1acabde0d8c7be7cba8a1c010c46522355e127a1e3bc' 
  AND token = 'r9/pck9R44pCTRtcjbVxihe2IVG2ApWGgSdYwlMrBng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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