Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e8c5e18e6b0ad0455fdd3648b33268f881f33abdb5f86cf28d716b19aae0237' 
  AND token = 'rnGPfbHaqPAdXqWIQF3hSNAOLaKXTm55+aQJTiV8Mtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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