SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05bcd63ef83ac3fa75a5f024d8965933beb400b6859442d9ec8ef21b1e5ad0c9' 
  AND token = 'DKVZUUewpHcYy+0c2z/2TUVxWVIfX/KCAuzj95KEGA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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