SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89b3c585493312c6babe08b39440b8ff41c2b5f105df2a77febc16bb020ce08e' 
  AND token = 'zdvTQY60QUdPf++lLi/BdJMhc5JlVSl5iYBcrCB0wg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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