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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c9b5ea66a339b13a72bf4987af79535ed727b912f558b378530168a39bf2225' 
  AND token = 'Zjk8n8oTNJa09mIb9ttZPU0ust2j794XYLhXd98ag1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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