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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc848aa683bbb08d76e0fc904ba1f1d326dc53dff0c0a140655f5ad84d681cc5' 
  AND token = '0HArEpUht761Kc8TseE4ujEDuOZAR8A5vij5FINgL3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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