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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abc29a028a2ee54618cd29fe810681324b117cd1ada7489c0d4985edaa512151' 
  AND token = 'AG/w5oIFhSrU2mI5NIyE/vdn252D11aUY8Juk/Xfq2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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