SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6466609324babc54a3cc93e8c89d7306a48725ed656b63c91bf2f4b781d850be' 
  AND token = 'NUWQTB0fxw8Aw4miuDjvi/Ps0X+sg9gAKK7ioA5C/xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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