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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a757e1f782112f4e8ba7cb614fed2d3b6b83fd5c3d221ef1ba199b666fec5b9' 
  AND token = '8zsud7b0/SF9GX1SJ9E788BW3TaHr8/k2lCPGvucj4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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