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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69bbb5141c0da0b79e19f1b45a53ac783d4bd40285262358fc4a03be4353a57a' 
  AND token = 'ZRD6Fmzf3+CaMP3ufxNvMRwxsxCCtwpDZ9yWsuUp1Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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