SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8464d3ef0fde253053531dbd1b67064c34f076f8dd1c846a442e192241081141' 
  AND token = 'cnR7cNHNA5FVpYX4wyhOmhBWCNCjvI6NhZvKCDYTtWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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