SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33dc6f0c89e9ef872a0b53595bbe5e6b68a86485418a2e4d06433ef7f897bce6' 
  AND token = '53zdS5CilViQI+MJZqcVSvQCsqKcjZm1966mX6NbUtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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