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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a48490b299fe6b5bcc0ab13ac18b026eacb7bc7391fbdb19730bb396d435311c' 
  AND token = 'ckCInuOMpIq62Q8jFs4lGvasdMCOo+VB4YOZxH1MfoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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