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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '801fe9b31ad3d8d5b517a404e563257fd0aa0f86edf012e569dcf4322ccb2044' 
  AND token = '1bLNnAKXQ2j7wrGsGgPoeFEylXlwBgr45hNUpA65NnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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