SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bc19ef44f740d294085a7d9f4495d68e552a3c3a690a106a4f081f8f191489d' 
  AND token = 'HoN3GAkx71IFjwtd0hYgwuX6b+zz3k9qJPg/geNQ084=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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