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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32f5bd02b5cfca44fe43770489081d8f256a4388592ac2d556527698781e1b9a' 
  AND token = 'QSnsRvC9l4ZOVg0do+CclknOblbCw0TU5kee1sabjIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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