SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6e4008e94a35b7e699012e209161813346f885576dfa0698a6cac0fbb9ef0a2' 
  AND token = 'sIbmAO3OdLzCnJ/zPU6fRjXoUZvkFAlbC2yyd7OPGqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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