Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b5202ccbf836ce49582bb73fce921fc067e65885feda668e43df1849c0e257d' 
  AND token = 'fqdK1pzcbQLzOmqLUHzGIUsXeE6SQIr+texINTYTz9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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