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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bed35bf7d111c8083aecdbed46c60eee0ff977800d0c8eeb03581a0a80a117ec' 
  AND token = 'NChsKIgZ0YMV8ym09ph1kCRDEpiaHtYCYpXDqw6TD2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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