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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb05bab7aa0e5b88eee111bf3d7d9d3ce64044eec84d480bf226fa5bb5923499' 
  AND token = '/dsd8SvQ1TNFCcnkzrIDlzqMrROq1jDfaR75WZ1joeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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