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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a45b80aa4cd201cfc0ac7513a8e2a835ac1a60f8061a8a4eba834fe68df41db' 
  AND token = '2mqp6OvfMYRjeqU9ZoUTfrEZKQnkLgJ2OLyRJo0HwmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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