SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85d624388a3319b0495a46d60de9bb0f2f2d172473d62a35e1eb0bff160c51ea' 
  AND token = 'VlUyZD6KJ8mw81gz7AIhLxZXhLzBWy4FmxDWZpLI5Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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