SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e0b04245001b7d618acf99d52cac4798ad6a828156c334af1acee67d8799f4d' 
  AND token = '3QD9VNCtXmrICb0KI7JEV1hOZdDBC/J6LnLSHqJyIWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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