SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48c515f6d824c6e67cba5488491a82e5f7f33d3d390626cf154ab2272bbd7fb4' 
  AND token = 'q+LCa/+VE8w6mny6nP7DbAvOJNwlgj26rjnFWGeSyRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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