Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4f6919571f44ff5947d549cdfe6cfccaa54c62919ae87666c3d71fbd9d8aa80' 
  AND token = 'BhlKAc9SoN3hDhDgjiSaKRn2BAGUd8z/v8y4qGkW3cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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