SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bfc71f0ad2063264941eb5c2da1462db45119279b06e5c54b13739ddbc76a51' 
  AND token = 'K16X0OI7IJ8w4mTxRVk5mCud8zdPwUZKOsowgbwslh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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