SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9716ca1114923b9686b3f276b3558606356542fab08f2c7099636fdbfaaeb9a9' 
  AND token = 'dULro4/bPA+irN7AphzNgSdHYB3DhgrvesDwye0jwmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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