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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '115988374196ed2aca7a8824f4d6eefafcec25f99bbece1c67f8a97fc66e96d6' 
  AND token = 'ksrZrCpD+dt4Jq/n/QPUdf+yHvHX5i/4qJPVluu2HX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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