SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '515fa33b885af9939b233ea408d1f4196ce366f56fc148db00fc3fa6f259b5c3' 
  AND token = 'N7FV78AE/LWGcCeGnFcxn1+FxPihhJc4xKTNwv7nqzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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