SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc961a02508e66087b82e6cc9161b08e899a307f6d7693772b3ffda205f207f3' 
  AND token = '3K+smvZCN/Ch/BUsL2qXavVJ0aC0SgAymbD7bojQTpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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