SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5809fed4fd311ca11928c2e542c2500384507286708044694562f96e13cf5093' 
  AND token = 'xBDz2bGK76Z/fzQQ1FVYVXzR7SdgYVR8IjuvOA5ZUh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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