SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00f3ee94bf772b4b704245f7ad012c8e797bc8468b1eec46c213ce59a34de0a0' 
  AND token = '795gVJ7qa1+XEVDhN9D/pXVJL+CHVorhVRlJvAZWwN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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