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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73e5cc2aaf8c2e3d1999b4e874539c863d77a3c70c9d4c31a6885efd73577bb1' 
  AND token = 'Vwu5FNiKPrL86FpYWcQjsbojF/O6/m9iV2pCaDxFYfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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