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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bd631f7e03218c2e3349908949ac90e76ab292d2ae2383ebf2d3363e6f59b06' 
  AND token = 'EU9K89/MSVugcofiFgmkyql023b/yzccSuLadfz3QCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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