SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '884af298ee56101f3f654ca6ac837f5629b68c9958e2775dd227e3f350e7c944' 
  AND token = 'MvCddnK2gzneXMYJce/7+DvWdlaVG7zY7wv7TH1b5mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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