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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9611209cd8041be01008c35a88a4536e3bb30f8463a2f3287b520de2e74a9280' 
  AND token = '76I+0+W9mfo1yeX4QohNxv5uHpwI6T+GgBDXiEDq0qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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