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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dced00d463ef5f279b0d52d408c9853f866dfc64b17dab2503c2bae0be9d029' 
  AND token = 'g0e7uymiYeom20GH9mU/BQHAS4yGCDp9uSLe4xt9YyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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