SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd47066daad1fbb7e3ec968205d28a742f3590041daa916bab95ad07281724b5' 
  AND token = 'HmlQH+XInKqKbJ/ZnE/YH0Kqgbikl5Lba2TNPzaBRog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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