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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bddd80afee9f1c10f614f50a73ea6d7728c83e1bc466f9cd6f1482818e9b91d4' 
  AND token = 'WcDIMDNYHSkIxpfyxg0FUZeceOtFjmP/Rq1iUmje/GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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