SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17c59ca0b2fb5179afbe112918367913266dbf0f7b88ec1775a89c412c8baa96' 
  AND token = 'j/3Vm3V2gviCVX/UMMnTsuEVyolI+ffhqummp9G3w70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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