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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef42b0749b406ef15019a44e9d019b2ab8e558ba994be157ae644df44960c921' 
  AND token = 'nRwcLmMB2IakRYtrCErir4NS7xo5KUluj8VGpI/ZEmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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