SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bf8e6034209cac19f741cbaed70ac2a79f3969ea098e03c150f4c5af41fd2c6' 
  AND token = 'wjUwFhdWMi5kS3Gv/UereVK/HtqyXgx/qenUm2mzTSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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