SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86f777c3f9a625a70685c7edd54a9ae4fae0c78092a39ac695433fad6d438102' 
  AND token = 'H/0zebcBjxz4XuzjVnI3lz1brGmgriMvLdXreCHZZgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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