SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01b5e1592e756b6123a3d2411ad5e517d83e5d498354dfb4f137d80b52e313d3' 
  AND token = '0TVIKvjs9BeqFUfBXxTNoC5Drpg2+LhZaCIQ6+rzDI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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