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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38cc46dcf035d05132ba7e54e83ebe80d6cc7b617ab357f039062a8b396dfee5' 
  AND token = 'P0l6ta5V+zPpFtXo6cxsRBd+5NNK0S3g4AaTgByGHic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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