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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '069f373444ec49fc84fd58dd9eebf83761e3d7e0a59e6a5daaf4e97db1944cea' 
  AND token = 'zOjvARv3iGq7+RMR757I7wuv5sQ/H3W4gZYnOk2ykbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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