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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2fa73a4acd5eafdba7742a465480f1cfaf7ef239b581a7d57dc4953068f45c8' 
  AND token = 'iRsMT1F8JP4gV3FRciJlVji0svDo8XlkLAihKRPfBmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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