Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd86430378c8abdaf63d3c078f7b0f604da0212e57a44d349286478782da4f726' 
  AND token = 'qo0urVhLFEE1c3h2jDbdurKFhSd27gSsbZrMKTKINjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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