SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a079842f5f9af5aabd9bd5b5ccfad9b5f0cc1e779724061135a851c3bb2f6f7' 
  AND token = 'FSlcCeiHs8J8kWzBCpe2YRC5mz4LRIqw/o3fgawW/h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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