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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc6ae1253233bff314034d9781d01dae42516b1b7ebafd9d92ae0453a251eb8f' 
  AND token = '0EFozWJ8k24Jo69egJNnfUbx3qxwaTNUfXXgLzd+XfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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