Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b8ed7b4f12cb8e30d54fbd9587b9c1ecf533ce49c76abc795f53ecfb5b1310e' 
  AND token = 'zM81q3XeQfTdUYYVO25ORTre5/RSlrAcNawRn82dE3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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