SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dd49348be541b62e39b3f36cfac01f9c9826d835e65d0e188ec231a8a05cb05' 
  AND token = 'VfInZIZeDl2PHR7R1xxVrYkhISFsRwxIqwcLJBKEPJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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