SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25d4801b334b4aa1d952c095397a6226b20ecfd85048547794e295c6ec329cab' 
  AND token = 'roRvnsY4HIByr79n0G+jlymtJGF/jmJPQJuEwqfpv5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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