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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0891ec9b339f10ec5ab48d95154db3419a19251aa82bc92a7a07d861cd820ff3' 
  AND token = 'N8yd/vpXEHHV3GWq15NRVr6nKrZO7hh2oTirPVCHLQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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