SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56df59c695b5761d4ad6d42b11548d6149681e8e042d5a9b159295e258f7788f' 
  AND token = 'rHdssdJHD1CYm3Sov+n1ujWqSqr/xKMYQPjhcvP14vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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