SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2274503cb45b2dfbf7114e8f24b77a9c7f9ddd09a21f4f080f37a4527b22a66' 
  AND token = 'XbjUzSjAM9ZRHQqo3pyk6aCvk5bfKlSIsa2GlLVxYxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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