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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b616a9df3d01770e46a959bc0f5017200c8421182424d84233d951c12aad59e' 
  AND token = 'PXl2lunz9hEvM41AqC0/OQdCcO8roiQQIVSjeQPvcko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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