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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3db67bbf5eddecd945764e06cb8a6e85e9f26edcc9fa05ed4f108241f96d5710' 
  AND token = '9KMwHxYf4x4DcKTB/Os1BSBJ8TRC2ofiY5DN6qaBbiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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