SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16dfb37f6957f3f8bd41817c3a9b246d2633a853966ba89c6b5d54bad2bb1c02' 
  AND token = '/1kIYycIcJ7VjV2L4AjxRLvpAHZB7tV0WCoTUl2FwcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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