SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a36b9fbd9d3c6b4466846507c70285768dc05e9195b8a69f5ce9ab31aecf1bd9' 
  AND token = 'cAedtz7Ljwdu/zf+WBtP4KcBsBsajEWAqN3XVnJ1mDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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