Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6e8f4477d3399a5b1a981b0b875963a03b9f464c86efdcaa3cedc89935fcb2e' 
  AND token = 'gP6PMm3egMkmMaGz4fzQZCBaF1Y+zVfvg5cH0XN834k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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